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Automotive Innovation 2023年第3期6卷 438-452页

作者： Huifan deng Youqun Zhao Qiuwei Wang Anh‑Tu Nguyen department of Vehicle Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Laboratory LAMIH‑CNRS UMR 8201Universite Polytechnique Hauts-de-France59300 ValenciennesHauts‑de‑FranceFrance INSA hauts-de-france 59300 ValenciennesFrance

Uncertain environment on multi-lane highway,e.g.,the stochastic lane-change maneuver of surrounding vehicles,is a big challenge for achieving safe automated highway *** improve the driving safety,a heuristic reinforcement learning decision-making framework with integrated risk assessment is ***,the framework includes a long short-term memory model to predict the trajectory of surrounding vehicles and a future integrated risk assessment model to estimate the possible driving ***,a heuristic decaying state entropy deep reinforcement learning algorithm is introduced to address the exploration and exploitation dilemma of reinforcement ***,the framework also includes a rule-based vehicle decision model for interaction decision problems with surrounding *** proposed framework is validated in both low-density and high-density traffic *** results show that the traffic efficiency and vehicle safety are both improved compared to the common dueling double deep Q-Network method and rule-based method.

关键词： Automated driving decision making Uncertain driving environments Reinforcement learning Multi-lane traffic Integrated risk assessment

Validating the CorrectWearing of Protection Mask by Taking a Selfie:design of a Mobile Application“CheckYourMask”to Limit the Spread of COVID-19

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Computer Modeling in Engineering & Sciences 2020年第9期124卷 1049-1059页

作者： Karim Hammoudi Adnane Cabani Halim Benhabiles Mahmoud Melkemi department of Computer Science Universitéde Haute-AlsaceIRIMASMulhouseF-68100France universitéde Strasbourg Strasbourg67081France Normandie Univ UNIROUENESIGELECIRSEEMRouen76000France Univ.Lille CNRSCentrale LilleUniv.Polytechnique Hauts-de-FranceYncrea Hauts-de-FranceUMR 8520-IEMNLille

In a context of a virus that is transmissive by sputtering,wearing masks appear necessary to protect the wearer and to limit the propagation of the ***,we are facing the 2019-2020 coronavirus *** disease 2019(COVID-19)is an infectious disease with first symptoms similar to the *** symptom of COVID-19 was reported first in China and very quickly spreads to the rest of the *** COVID-19 contagiousness is known to be high by comparison with the *** this paper,we propose a design of a mobile application for permitting everyone having a smartphone and being able to take a picture to verify that his/her protection mask is correctly positioned on his/her *** application can be particularly useful for people using face protection mask for the first time and notably for children and old *** designed method exploits Haar-like feature descriptors to detect key features of the face and a decision-making algorithm is *** results show the potential of this method in the validation of the correct mask *** the best of our knowledge,our work is the only one that currently proposes a mobile application design“CheckYourMask”for validating the correct wearing of protection mask.

关键词： Face protection masks public health support health education COVID-19 coronavirus e-health m-health mobile health public health system epidemic prevention and control

Gate length dependent transport properties of in-plane core-shell nanowires with raised contacts

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Nano Research 2020年第1期13卷 61-66页

作者： Alexandre Bucamp Christophe Coinon David Troadec Sylvie Lepilliet Gilles Patriarche Xavier Wallart Ludovic desplanque Univ.Lille CNRSCentrale LilleYncréa ISENUniv.Polytechnique Hauts-de-FranceUMR 8520-IEMNF-59000LilleFrance C2N-UMR 9001 CNRS UniversitéParis-Sud-UniversitéParis-Saclay91120PalaiseauFrance

Three-dimensional(3D)nanoscale crystal shaping has become essential for the precise design of advanced electronic and quantum devices based on electrically gated *** this context,Ⅲ-Ⅴ semiconductor-based nanowires with low electron effective mass and strong spin-orbit coupling are particularly investigated because of their exceptional quantum transport properties and the good electrostatic control they *** the main challenges involved in the processing of these nanodevices are(i)the management of the gate stack which requires ex-situ passivation treatment to reduce the density of traps at the oxide/semiconductor interface,(ii)the ability to get good ohmic contacts for source and drain electrodes and(iii)the scalability and reliability of the process for the fabrication of complex architectures based on nanowire *** this paper,we show that selective area molecular beam epitaxy of in-plane InGaAs/InP core-shell nanowires with raised heavily doped source and drain contacts can address these different *** characterization of the devices down to 4 K reveals the positive impact of the InP shell on the gate electrostatic control and effective electron *** comparable to the best reported values for In(Ga)As nanostructures grown on InP,this latter is severely reduced for sub-100 nm channel highlighting remaining issue to reach the ballistic regime.

关键词： molecular beam epitaxy core-shell nanowire selective area growth effective electron mobility

Conformally flat, minimal, Lagrangian submanifolds in complex space forms

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Science China Mathematics 2022年第8期65卷 1641-1660页

作者： Miroslava Antić Luc Vrancken Faculty of Mathematics University of BelgradeBelgrade 11000Serbia Laboratoire de Mathématiques pour l’Ingénieur Université Polytechnique Hauts-de-FranceValenciennes 59313France departement Wiskunde Katholieke Universiteit LeuvenLeuven 3001Belgium

We investigate n-dimensional(n≥4),conformally flat,minimal,Lagrangian submanifolds of the n-dimensional complex space form in terms of the multiplicities of the eigenvalues of the Schouten tensor and classify those that admit at most one eigenvalue of multiplicity *** the case where the ambient space is Cn,the quasi umbilical case was studied in Blair(2007).However,the classification there is not complete and several examples are ***,we complete(and extend) the classification and we also deal with the case where the ambient complex space form has non-vanishing holomorphic sectional curvature.

关键词： Lagrangian submanifolds conformally flat complex space form warped product submanifold

Unveiling the lamellar structure of the human cornea over its full thickness using polarization-resolved SHG microscopy

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Light(Science & Applications) 2023年第9期12卷 1782-1794页

作者： Clothilde Raoux Anatole Chessel Pierre Mahou Gaël Latour Marie-Claire Schanne-Klein Laboratory for Optics and Biosciences Ecole PolytechniqueCNRSINSERMInstitut Polytechnique de Paris91128 PalaiseauFrance universitéParis-Saclay 91190 Gif-sur-YvetteFrance

A key property of the human cornea is to maintain its curvature and consequently its refraction capability despite daily changes in intraocular *** is closely related to the multiscale structure of the corneal stroma,which consists of 1-3µm-thick stacked lamellae made of thin collagen ***,the distribution,size,and orientation of these lamellae along the depth of the cornea are poorly characterized up to *** this study,we use second harmonic generation(SHG)microscopy to visualize the collagen distribution over the full depth of 10 intact and unstained human corneas(500-600µm thick).We take advantage of the small coherence length in epi-detection to axially resolve the lamellae while maintaining the corneal physiological ***,as raw epi-detected SHG images are spatially homogenous because of the sub-wavelength size of stromal collagen fibrils,we use a polarimetric approach to measure the collagen orientation in every *** a careful validation of this approach,we show that the collagen lamellae(i)are mostly oriented along the inferior-superior axis in the anterior stroma and along the nasal-temporal axis in the posterior stroma,with a gradual shift in between and(ii)exhibit more disorder in the anterior *** results represent the first quantitative characterization of the lamellar structure of the human cornea continuously along its entire thickness with micrometric *** also shows the unique potential of P-SHG microscopy for imaging of collagen distribution in thick dense tissues.

关键词： structure curvature resolved

Fuzzy Unknown Input Observer for Estimating Sensor and Actuator Cyber‑Attacks in Intelligent Connected Vehicles

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Automotive Innovation 2023年第2期6卷 164-175页

作者： Juntao Pan Anh‑Tu Nguyen Sujun Wang Huifan deng Hui Zhang School of Electrical and Information Engineering North Minzu UniversityYinchuan 750021China universitépolytechnique hauts-de-france CNRSUMR 8201–LAMIH59313 ValenciennesFrance INSA hauts-de-france 59313 ValenciennesFrance department of Vehicle Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China School of Transportation Science and Engineering Beihang UniversityBeijing 100191China

The detection and mitigation of cyber-attacks in connected vehicle systems(CVSs)are critical for ensuring the security of intelligent connected *** paper presents a solution to estimate sensor and actuator cyber-attacks in CVSs.A novel method is proposed that utilizes an augmented system representation technique and a nonlinear unknown input observer(UIO)to achieve asymptotic estimation of both CVS dynamics and *** nonlinear CVS dynamics is represented in a Takagi–Sugeno(TS)fuzzy form with nonlinear consequents,which allows for the effective use of the differential mean value theorem to handle unmeasured premise ***,via Lyapunov stability theory sufficient conditions are proposed,expressed in terms of linear matrix inequalities,to design TS fuzzy *** test scenarios are performed with high-fidelity Simulink-CarSim co-simulations to show the effectiveness of the proposed cyber-attack estimation method.

关键词： Connected vehicle systems Cyber-attacks Unknown input observers Vehicle dynamics estimation Takagi-Sugeno fuzzy models

Introduction to Mesh Based Generated Lumped Parameter Models for Electromagnetic Problems using Triangular Elements

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CES Transactions on Electrical Machines and Systems 2023年第1期7卷 21-34页

作者： Haidar Y.Diab Salim Asfirane Nicolas Bracikowski Frédéric Gillon Yacine Amara universitéLe Havre Normandie Le Havre76600France Département Génie Industriel et Maintenance Nantes UniversitéSt-Nazaire44602France Ecole Centrale de Lille Hauts-de-France59651France IEEE

This paper is an introduction to mesh based generated reluctance network modeling using triangular *** contributions on mesh based generated reluctance networks using rectangular shaped elements have been published,but very few on those generated from a mesh using triangular *** use of triangular elements is aimed at extending the application of the approach to any shape of modeled *** concepts of the approach are presented in the case of electromagnetic *** procedure for coding the approach in the case of a flat linear permanent magnet machine is *** developed under MATLAB environment are also included.

关键词： Lumped parameter modeling Finite element method Mesh Triangular elements Electromagnetic devices Modeling

NUMERICAL LOCALIZATION OF ELECTROMAGNETIC IMPERFECTIONS FROM A PERTURBATION FORMULA IN THREE DIMENSIONS

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Journal of Computational Mathematics 2008年第2期26卷 149-195页

作者： M.Asch S.M.Mefire LAMFA Université de PicardieCNRs33rue Saint-Leu80039 AmiensFrance CMAP Ecole PolytechniqueCNRSRoute de Saclay91128 PalaiseauFrance

This work deals with the numerical localization of small electromagnetic inhomogeneities. The underlying inverse problem considers, in a three-dimensional bounded domain, the time-harmonic Maxwell equations formulated in electric field. Typically, the domain contains a finite number of unknown inhomogeneities of small volume and the inverse problem attempts to localize these inhomogeneities from a finite number of boundary measurements. Our localization approach is based on a recent framework that uses an asymptotic expansion for the perturbations in the tangential boundary trace of the curl of the electric field. We present three numerical localization procedures resulting from the combination of this asymptotic expansion with each of the following inversion algorithms： the Current Projection method, the MUltiple Signal Classification （MUSIC） algorithm, and an Inverse Fourier method. We perform a numerical study of the asymptotic expansion and compare the numerical results obtained from the three localization procedures in different settings.

关键词： Inverse problems Maxwell equations Electric fields Three-dimensional inho-mogeneities Electrical impedance tomography Current projection method MUSIC algo-rithm FFT Edge elements Numerical boundary measurements

On product affine hyperspheres in R^n+1

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Science China Mathematics 2020年第10期63卷 2055-2078页

作者： Xiuxiu Cheng Zejun Hu Marilena Moruz Luc Vrancken School of Mathematics and Statistics Zhengzhou UniversityZhengzhou 450001China Henan Key Laboratory of Financial Engineering Zhengzhou 450001China department of Mathematics KU LeuvenLeuven 3001Belgium Institut des Sciences et Techniques de Valenciennes(ISTV) Universit´e Polytechnique Hauts de FranceValenciennes 59313France

In this paper,we study locally strongly convex affine hyperspheres in the unimodular affine space Rn+1 which,as Riemannian manifolds,are locally isometric to the Riemannian product of two Riemannian manifolds both possessing constant sectional *** the main result,a complete classification of such affine hyperspheres is ***,as direct consequences,3-and 4-dimensional affine hyperspheres with parallel Ricci tensor are also classified.

关键词： affine hypersurface affine metric affine hypersphere Levi-Civita connection constant sectional curvature parallel Ricci tensor

A FAST FREE MEMORY METHOD FOR AN EFFICIENT COMPUTATION OF CONVOLUTION KERNELS

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Journal of Computational Mathematics 2023年第6期41卷 1093-1116页

作者： Matthieu Aussal Marc Bakry Ecole polytechnique(CMAP) INRIAInstitut Polytechnique ParisRoute de Saclay 91128PalaiseauFrance

We introduce the Fast Free Memory method(FFM),a new implementation of the Fast Multipole Method(FMM)for the evaluation of convolution *** FFM aims at being easier to implement while maintaining a high level of performance,capable of handling industrially-sized *** FFM avoids the implementation of a recursive tree and is a kernel independent *** give the algorithm and the relevant complexity *** quasi-linear complexity enables the evaluation of convolution products with up to one billion *** illustrate numerically the capacities of the FFM by solving Boundary Integral Equations problems featuring dozen of millions of *** implementation is made freely available under the GPL 3.0 license within the Gypsilab framework.

关键词： Convolution product Fast multipole method Boundary integral equations Open-source